Eh, Kubo's character designs are as hit or miss as modern TM/Takeuchi's. Some of his characters' clothing and fashion are straight up terrible imo, like they're way too over-thought and over-designed (much like a certain Tetsuya Nomura and his belt fetish).
Plus a lot of his weapon designs look incredibly dumb and come off more as cosplayer props than something that would be used in a fight. Koyama's works in F/SN alone wipe the floor with him in that department.